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Finding the Fourth Proportional to 387,783.65, 535,173.74 and 215,734.02

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Solution

The fourth proportional to 387,783.65, 535,173.74 and 215,734.02 is: 297,730.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,783.65 : 535,173.74 = 215,734.02 : x
  2. Step 2: Convert to fraction form
    387,783.65/535,173.74 = 215,734.02/x
  3. Step 3: Cross multiply
    387,783.65x = 535,173.74 × 215,734.02
  4. Step 4: Simplify right side
    387,783.65x = 115,455,181,249.97
  5. Step 5: Solve for x
    x = 115,455,181,249.97/387,783.65
  6. Step 6: Final answer
    x = 297,730.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.